Import 300x Non-Surge Check Valve — Buy in wholesale FOB from Supplier in China

The 300X Non-Surge Check Valve is a hydraulically operated automatic valve designed to prevent backflow while eliminating water hammer and pressure surge in pumped pipeline systems. The 300X designation refers to a Chinese valve standard series for multifunctional water control valves, with the non-surge variant incorporating a slow-closing mechanism to dampen velocity changes. Shanghai Shinjo Valve Co., Ltd. manufactures this model from cast iron, ductile iron, or WCB (cast carbon steel) body materials, with the specific grade selected per application pressure and media compatibility. The valve operates automatically without external power, responding to differential pressure across the disc to open on forward flow and close on flow reversal.

The non-surge function is achieved through a pilot-controlled closing mechanism, typically featuring an adjustable needle valve and buffer cylinder that regulates disc closure speed over 2-60 seconds depending on installation tuning. Standard pressure ratings for this valve class are PN10, PN16, or PN25 (1.0, 1.6, 2.5 MPa respectively), with flange connections conforming to GB, DIN, ANSI, or JIS standards. The disc and seat are typically stainless steel or bronze-trimmed for corrosion resistance, with EPDM or NBR elastomer seals standard for water service. The 300X series is distinguished from simple swing check valves by its ability to prevent slam closure in vertical or horizontal installations with high-velocity media.

Primary applications include municipal water supply booster stations, building HVAC circulation systems, fire pump discharge lines, and industrial cooling water circuits where pump stop events risk pressure spikes. Buyers for water utilities, EPC contractors, and MRO procurement for commercial buildings represent the core market. Shanghai Shinjo Valve Co., Ltd., located at No 150 Hongxing Road, Shanghai, offers this valve with flexible MOQ and cites ISO and CE certification claims that importers must independently verify with the supplier before tender participation.

Shanghai Shinjo Valve Co., Ltd. operates from No 150, Hongxing Road, Shanghai, 200000, China. The company holds a 'harbor' trust tier on the platform, with a recorded response rate of 0.00% and zero average response hours, indicating no response history through this channel. The supplier profile positions the firm as a manufacturer of industrial valves for water supply, wastewater, and chemical processing sectors, with this 300X check valve representing its product offering in automatic control valves.

The source description claims ISO and CE certifications, though no certificate numbers, accrediting bodies, or scope of certification are provided. No workforce data, annual production capacity, year of inclusion of business, or named clients are stated. Buyers should conduct independent verification of manufacturing credentials, request factory inspection reports, and confirm that claimed certifications cover the specific 300X valve model rather than generic company registration. The supplier's address in central Shanghai suggests office or trading company presence; manufacturing location may differ and should be confirmed.